Uri Parameter are not escaped

[KN4CK3R]

The method InfluxDbClientBase.BuildUri escapes username and password but not the extra parameters.

I ran a select query which contained the character ':'. The server responed with a parsing error. Then I changed the code to HttpUtility.UrlEncode(param.Value) but it didn't work because the ':' was not escaped. Then I changed HttpUtility.UrlEncode to use Uri.EscapeDataString. Now everything was escaped correctly and the server accepted the query.

I haven't created a pull request because I'm not sure if this was the correct way to go.